Helsinki weather in October
Temperature, sea and sunshine in October: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in October
Poor
Best time to visit: June – August
What is the weather like in Helsinki in October?
In October, Helsinki is cold: daytime highs average 9 °C, and nights cool down to about 5 °C. The sea averages 10.6 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Rain is frequent, with about 12 rainy days and 61 mm in total. All in all, October is not an ideal month for a holiday in Helsinki.
October compared
How the weather changes from September to November. Tap a month to open it.
| SeptemberSep | OctoberOct | NovemberNov | |
|---|---|---|---|
| Score | 59 | 16 | 13 |
| Day | 15° | 9° | 4° |
| Night | 10° | 5° | 1° |
| Sea | 15° | 11° | 7° |
| Sun | 5 h | 3 h | 1 h |
| Rain days | 10 | 12 | 12 |
More details for October
- Daylight
- 10 h 17 min07:57 – 18:14
- UV index
- 1 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or more
- Wind
- 20 km/haverage daily peak
- Cloud cover
- 75 %on average
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+3Europe/Helsinki
How the score comes together
- Temperatureweight 50 %5 %
- Sunshineweight 20 %0 %
- Few rainy daysweight 30 %46 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- Warm jacket
- Rain jacket or umbrella
Helsinki in October: quick answers
Is Helsinki hot in October?
No. In October, Helsinki is cold: daytime highs average 9 °C and nights drop to about 5 °C.
Can you swim in Helsinki in October?
Only if you don't mind cold water: in October the sea averages just 10.6 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Helsinki in October?
Rain is frequent, with about 12 rainy days and 61 mm in total.
Helsinki month by month
The whole year in HelsinkiAll destinations: FinlandWhere to go in OctoberSea temperature in October
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)